A B777 FLT ATTENDANT COMPLAINED THAT THE CAPT DID NOT PRACTICE EFFECTIVE COM WITH HIS CABIN ATTENDANT CREW AFTER EXPERIENCING SEVERE TURB DURING A FLT FROM RJAA TO ZZZ.

Narrative

WITHOUT WARNING; ACFT WENT INTO A SEVERE AND ABRUPT DROP. ALL PERSONS AND ITEMS NOT SECURED TO ACFT WERE THRUST UP INTO THE AIR. I WAS NEAR THE CEILING AND COULD SEE THE BEVERAGE CART HAD RISEN ABOVE PAX SEATS AS WELL. WHEN ACFT STOPPED DROP; ALL CARTS WERE OVERTURNED; COACH CABIN FLT ATTENDANTS WERE ON THE FLOOR; AND THE COACH CABIN WAS COVERED WITH BEVERAGES AND GARBAGE. A ROW OF OXYGEN MASKS AT ROW XX DEPLOYED. AS SOON AS I BELIEVED IT SAFE TO STAND; I MOVED TO; AND BELTED INTO; 3R JUMPSEAT. THE CAPT MADE A PA AND I MOVED THROUGH THE CABIN; CHKING FOR PAX INJURIES. NO INJURIES. AFTER CLEANING UP PAX; CABIN; AND OURSELVES; WE RESUMED SVC. THE ENTIRE CREW WENT THROUGH THE REST OF THE SVC 'IN SHOCK.' CAPT NEVER ADDRESSED THE SEVERITY OF THE DROP. HE NEVER EVEN CAME TO CHK OUT THE CABIN CREW OR THE CABIN CONDITION. HE DID NOT TALK TO ANYONE IN OUR CABIN TO ASK IF WE NEEDED MEDICAL ATTN; PHYSICALLY OR MENTALLY. ON LNDG; THE PAX DEPLANED AND THE COCKPIT CREW WAS GONE. THE FLT ATTENDANTS WERE MET BY FLT SVC SUPVRS AND ASSISTED TO A MEDICAL FACILITY. I FEEL THERE WAS NOTHING THAT COULD'VE PREVENTED THE ACFT DROP; BUT THE CAPT COULD'VE MADE AN EFFORT TO COMMUNICATE WITH THE CREW TO ENSURE CREW SAFETY AS WELL AS CHKING ACFT INTEGRITY TO SAFELY CONTINUE THE FLT.